Network Node Transmit Power Estimation for Interference
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Solution Overview
Problem
Current downlink interference estimation methods in LTE networks face inaccuracies due to mismatches between data and CRS transmissions, and limitations in IMR configurations, especially in dense deployments, leading to underestimation of interference and reduced network performance.
Innovation Solution
A method where network nodes estimate and transmit a power parameter based on predicted future transmit power to wireless devices, allowing them to accurately estimate interference by modifying the reference signal with a scaling factor, thereby improving interference estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CRS-based interference estimation is used, then interference estimation is available for all transmissions, but the estimated interference does not match actual data interference due to transmission mismatch
Solution Approach 1:
The network node performs preliminary actions by estimating future transmit power and providing this information to the wireless device before the actual data transmission occurs. This allows the wireless device to pre-calculate the expected interference level from the serving cell, enabling more accurate interference estimation that matches actual conditions.
Solution Approach 2:
The invention changes the parameter provided to the wireless device from static CRS-based interference values to dynamic power parameter information reflecting actual transmit power. By providing the power parameter that represents future transmit power, the system enables the wireless device to calculate interference that accurately reflects actual data transmission conditions rather than CRS transmission conditions.
2Measurement precision
If IMR configurations are used for interference estimation, then own signal impact is avoided, but interference underestimation occurs when cells reuse the same IMR configuration
Solution Approach 1:
The invention introduces an intermediary mechanism where the network node provides power parameter information to the wireless device. This power parameter acts as a mediator that enables the wireless device to calculate and subtract the serving cell's interference contribution from the total measured interference, thereby revealing the actual interference from other cells without relying on IMR configurations.
Solution Approach 2:
The system implements feedback by having the network node estimate future transmit power and provide this information back to the wireless device. The wireless device uses this feedback to accurately determine interference levels, enabling better link adaptation and interference management without being constrained by IMR configuration reuse limitations.
3Measurement precision
If network nodes transmit power information to wireless devices, then interference estimation accuracy improves, but signaling overhead increases
Solution Approach 1:
The power parameter provided to the wireless device serves multiple functions: it enables accurate interference estimation from the serving cell, supports link adaptation decisions, and facilitates interference coordination. By making this single parameter multi-functional, the system achieves significant performance improvements without proportionally increasing signaling overhead.
Data Source
AI summary
It is presented a method for assisting downlink interference estimation in a cellular network. The method is performed in a network node of the cellular network and comprises the steps of: estimating an average transmit power of the network node in a future time period; transmitting a power parameter based on the estimated average transmit power to at least one wireless device being served by the network node; and transmitting a reference signal for downlink interference estimation. A corresponding network node, wireless device, computer programs and computer program products are also presented.